I just duplicated the existing one and trashed it after.
No Copy paste, just duplicate the Content Template to a new one in the Content Template's list and then assign it properly.
But I confirm what you state:
CSS in the Builder's Cog and it breaks, remove that CSS and it works.
It seems we found the second counterpart in this issue along with the corruption of the names
I cannot replicate this locally though, on a fresh install with the latest bakery plugin and Toolset.
This could be due to some row or cell in the specific template, or similar, in conjunction with the CSS saved from the Builder.
I tried on your site with a new template and just added CSS - it seems to work?
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Now we should re-add piece by piece the parts of the broken template.
I would start by simply adding by the CSS first (a specific one)
If that already breaks the issue it'd be due to the specific CSS, but I suspect it relates to one of the several views in the template.
==> I did re-assign all back as it is so the site is not broken while I wait for your reply.
Please let me know if you see it working and if you can see what Bakery element produces the issue
I will asap try to figure this out as well, however, we cannot do these debug steps usually, I will need to find some time to allocate to test what happens re-implementing each part of the template... or deleting, so that is, in the broken one.
For now, I fixed the issue on your site by putting the CSS into the Content Template editor and re-instantiating the Builder - now there is an empty CSS of the builder but it should still be called by the template.
Otherwise better add it to the Theme, this is better anyway for performance and development purposes.
I will try to investigate this more as well according to your feedback you might have (I can still not replicate this clean, locally).
We may have a rare bug here, let's find it.
For now (immediate) the direct impact on your site should be addressable with the workarounds.